The top after-market NYSE gainers Monday were Heckmann Corp, Verifone Systems, Yum! Brands, Aqua America and GMX Resources. The top after-market NYSE losers were Baytex Energy Corp, Government Properties Income Trust, U.S. Silica Holdings, Iron Mountain and ReneSola Ltd.

Gainers

Heckmann Corp. (NYSE:HEK) shares rallied 8.36 percent to $4.02 in post-market trading. The company swung to fourth quarter net profit of $4.99 million or $0.03 per share compared to a net loss of $2.48 million or $0.02 per share in the same period last year and also came in better than Reuters' estimate of a loss of $0.02 per share.

Verifone Systems, Inc. (NYSE:PAY) shares climbed 7.58 percent to $22.01 in post-market trading. The company announced Monday that Douglas G. Bergeron is stepping down as Chief Executive Officer and member of the Board of Directors, effective Mar. 12. Richard McGinn, VeriFone’s Chairman, has been named Interim CEO and continues as a member of the Board.

Yum! Brands, Inc. (NYSE:YUM) shares climbed 6.29 percent to $72.11 in post-market trading. The company announced Monday that same-store sales for China division rose 2 percent in February. Yum! Brands also said first quarter same-store sales in China declined 20 percent, less than its prior estimate of a 25 percent drop.

Aqua America, Inc. (NYSE:WTR) shares surged 6.03 percent to $31.99 in post-market trading. The stock has a 52-week low of $21.52, a 52-week high of $30.33 and $4.23 billion in market capitalization.

GMX Resources, Inc. (NYSE:GMXR) shares gained 4.02 percent to $3.36 in post-market trading. The stock has a 52-week low of $1.80, a 52-week high of $23.66 and $20.54 million in market capitalization.

Losers

Baytex Energy Corp. (NYSE:BTE) shares plunged 6.30 percent to $41.20 in post-market trading. The stock has a 52-week low of $37.40, a 52-week high of $56.05 and $5.39 billion in market capitalization.

Government Properties Income Trust (NYSE:GOV) shares plunged 5.35 percent to $25.10 in post-market trading. The company announced Monday that CommonWealth REIT (CWH) has sold its remaining position in Government Properties through the sale of 9,950,000 common shares in an underwritten public offering under an effective shelf registration statement filed by Government Properties, at a price of $25.20 per share.

U.S. Silica Holdings, Inc. (NYSE:SLCA) shares plunged 4.56 percent to $25.32 in post-market trading. The company announced that a stockholder, GGC USS Holdings, LLC, an affiliate of Golden Gate Capital, has agreed to sell 8,500,000 shares of U.S. Silica common stock in an underwritten offering.

Iron Mountain Inc. (NYSE:IRM) shares declined 2.65 percent to $34.83 in post-market trading. The stock has a 52-week low of $27.10, a 52-week high of $37.70 and $6.17 billion in market capitalization.

ReneSola Ltd. (NYSE:SOL) shares fell 2.21 percent to $2.21 in post-market trading. The stock has a 52-week low of $1.08, a 52-week high of $3.02 and $195.05 million in market capitalization.